Makers Marks by Michael O'Connor & Sons

Michael O'Connor (1801-67) was one of the more prominent stained glass artists of the mid-century. In 1823 he studid in London in the stained glass studio of Thomas Willement. From 1835 he practised heraldic painting, stained glass production, and allied crafts in Dublin, coming back to England again in 1842, where he worked first in Bristol and then, from 1845 onwards, in London at 4 Berners Street, just off Oxford Street. His son Arthur (1826-73) became a partner in about 1851. Two other sons joined the firm: William Henry, in the 1860s, and William George Taylor (born 1822) in 1873.
See also VictorianWeb